Kiwifruit shows signs of dryness and defoliation on the edges of the leaves, browning of the pith or formation layer, and blackening (acute), or blackening of the veins (chronic). It usually occurs at different times after fertilization. Especially in the case of sunny days after heavy rains, the outbreak focused on the outbreak. Many fertilizers are caused by large amounts of unfermented organic fertilizers, excessive application of chemical fertilizers, excessive fertilization, and close to roots.
Prevention of fertilizer damage should start from the aspects of on-demand fertilization, scattered application, flushing with water, and formula fertilization. It should be noted that the roots of kiwifruit are fleshy roots with high osmotic potential and are not tolerant to high-concentration fertilizers, especially those with good water-solubility. Therefore, plucking or rotary ploughing after spreading and one-step operation of water and fertilizer should be promoted to avoid localized fertilization. Concentration, causing burning roots.
How to prevent:
Control the total amount of fertilizer, formula fertilization, the total nitrogen amount per acre does not exceed 50 kg of pure nitrogen throughout the year.
Pay attention to the application of organic fertilizer: from the autumn of October (or 10 days after fruit picking) apply no more than 3500 kg/mu of organic fertilizer, and add biological agents, multiple mineral fertilizers and 60% of fertilizers throughout the year.
Mature trees according to output, kg of fruit (organic) fertilizer. Organic Fertilizer: Fertilizer = 100:1, organic fertilizer mixed with 1/5 of bio-organic fertilizer. Mix 100 to 150 kg of superphosphate. Large-scale or high-yield plots, 100 kilograms of Maifanite powder per acre. It can also be sprayed with 100 times EM bacteria or 100 times liquid God Decoction. After the organic fertilizer is mixed and spread, or after spraying the inoculant, turn the organic fertilizer into the soil.
In the key period, it is suitable to top-dress top-dressing chemical fertilizers, and control them when there are leaves on the shelves so as to maximize the fertilizer efficiency. Specific: (1) After germination, nitrogen fertilizer is mainly used to apply compound fertilizer. (2) After flowering to fruit setting, nitrogen fertilizer was mainly used, and phosphorus and potassium compound fertilizer were applied. (3) Fruit enlargement: 30 to 40 days after flowering. Phosphorus and potash fertilizers are mainly used. (4) Pay attention to the application of potash fertilizer: Spray 4 to 6 times of foliar spray throughout the year. In the bud to fruit set, fruit mature (from August to October).
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